I will open my mouth in a parable: I will utter dark sayings of old:
I will open my mouth in a parable ( maashaal (H4912)) - a similitude (see note, Psalms 49:4).
I will utter - literally, sputter out (cf. Psalms 19:2, note); I will give vent to. The Spirit, after being pent up, eager for utterance, breaks forth like a gushing fountain.
Dark sayings - enigmas. The historical events which he details were enigmatical veils of religious truth, or instruction ( maskiyl (H4905), in the title) hidden beneath, which under the Spirit he unfolds. Compare the same use of sacred history in 1 Corinthians 10:6; Galatians 4:24.
Of old - Hebrew, 'from of old' (Psalms 77:5; Psalms 77:11). The past time of the Mosaic period.